title: Photoluminescence enhancement of carbon dots by gold nanoparticles conjugated via PAMAM dendrimers.
abstract: Carbon dots (CDs) have many fascinating fluorescent properties, however, their low quantum yield limits their applications. In this study, the photoluminescence (PL) of CDs in the vicinity of gold nanoparticles (Au NPs) is enhanced significantly due to the surface plasmon resonance (SPR) of the Au NPs. This is achieved by conjugating Au NPs and CDs to dendrimers (PAMAM) through an amidation reaction, resulting in the formation of the Au-PAMAM-CD conjugates. The maximum 62-fold enhancement was obtained with an optimized molar ratio between Au NPs, PAMAM, and CDs. In this process, PAMAM, which serves as a spacer, can keep Au NPs and CDs at an appropriate distance for PL enhancement. The adjustment of the amount of Au NPs or CDs linked to PAMAM can induce the optimum PL enhancement. This strategy can be easily applied to different metal-space-fluorophore systems to enhance the fluorescence of fluorophores.
authors.affiliation: Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, P.R. China. yhzhu@ecust.edu.cn.
authors.forename: Jie
authors.initials: J
authors.lastname: Zong
authors.forename: Xiaoling
authors.initials: X
authors.lastname: Yang
authors.forename: Adrian
authors.initials: A
authors.lastname: Trinchi
authors.forename: Simon
authors.initials: S
authors.lastname: Hardin
authors.forename: Ivan
authors.initials: I
authors.lastname: Cole
authors.forename: Yihua
authors.initials: Y
authors.lastname: Zhu
authors.forename: Chunzhong
authors.initials: C
authors.lastname: Li
authors.forename: Tim
authors.initials: T
authors.lastname: Muster
authors.forename: Gang
authors.initials: G
authors.lastname: Wei